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876c553cb4
linux/fs/nfsd
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Jeff Layton 876c553cb4 NFSD: verify the opened dentry after setting a delegation 
Between opening a file and setting a delegation on it, someone could
rename or unlink the dentry. If this happens, we do not want to grant a
delegation on the open.

On a CLAIM_NULL open, we're opening by filename, and we may (in the
non-create case) or may not (in the create case) be holding i_rwsem
when attempting to set a delegation.  The latter case allows a
race.

After getting a lease, redo the lookup of the file being opened and
validate that the resulting dentry matches the one in the open file
description.

To properly redo the lookup we need an rqst pointer to pass to
nfsd_lookup_dentry(), so make sure that is available.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2022-07-29 20:17:00 -04:00
..
acl.h
auth.c
auth.h
blocklayout.c block: remove genhd.h 2022-02-02 07:49:59 -07:00
blocklayoutxdr.c
blocklayoutxdr.h
cache.h
current_stateid.h
export.c fs: add is_idmapped_mnt() helper 2021-12-03 18:44:06 +01:00
export.h
fault_inject.c
filecache.c NFSD: Ensure nf_inode is never dereferenced 2022-07-29 20:16:56 -04:00
filecache.h NFSD: Ensure nf_inode is never dereferenced 2022-07-29 20:16:56 -04:00
flexfilelayout.c nfsd: use correct format characters 2022-03-17 19:47:38 -04:00
flexfilelayoutxdr.c
flexfilelayoutxdr.h
idmap.h
Kconfig NFSD: Remove CONFIG_NFSD_V3 2022-03-11 10:25:14 -05:00
lockd.c NFSD: simplify struct nfsfh 2021-10-02 15:51:10 -04:00
Makefile NFSD: Remove CONFIG_NFSD_V3 2022-03-11 10:25:14 -05:00
netns.h NFSD: limit the number of v4 clients to 1024 per 1GB of system memory 2022-07-29 20:16:56 -04:00
nfs2acl.c SUNRPC: Return true/false (not 1/0) from bool functions 2022-03-27 23:25:52 -04:00
nfs3acl.c SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
nfs3proc.c NFSD: Refactor NFSv3 CREATE 2022-05-20 13:18:24 -04:00
nfs3xdr.c NFSD: Deprecate NFS_OFFSET_MAX 2022-02-09 09:24:40 -05:00
nfs4acl.c
nfs4callback.c NFSD: Move copy offload callback arguments into a separate structure 2022-07-29 20:17:00 -04:00
nfs4idmap.c
nfs4layouts.c nfsd: fix using the correct variable for sizeof() 2022-03-20 12:49:38 -04:00
nfs4proc.c NFSD: verify the opened dentry after setting a delegation 2022-07-29 20:17:00 -04:00
nfs4recover.c nfsd: Fix nsfd startup race (again) 2021-12-10 11:54:59 -05:00
nfs4state.c NFSD: verify the opened dentry after setting a delegation 2022-07-29 20:17:00 -04:00
nfs4xdr.c NFSD: Replace boolean fields in struct nfsd4_copy 2022-07-29 20:16:59 -04:00
nfscache.c nfsd: destroy percpu stats counters after reply cache shutdown 2022-05-23 15:22:17 -04:00
nfsctl.c nfsd: silence extraneous printk on nfsd.ko insertion 2022-07-29 20:16:56 -04:00
nfsd.h NFSD: limit the number of v4 clients to 1024 per 1GB of system memory 2022-07-29 20:16:56 -04:00
nfsfh.c NFSD: Instrument fh_verify() 2022-07-29 20:08:56 -04:00
nfsfh.h NFSD: Remove CONFIG_NFSD_V3 2022-03-11 10:25:14 -05:00
nfsproc.c NFSD: prevent underflow in nfssvc_decode_writeargs() 2022-03-15 09:35:56 -04:00
nfssvc.c NFSD: Remove CONFIG_NFSD_V3 2022-03-11 10:25:14 -05:00
nfsxdr.c SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
pnfs.h
state.h NFSD: Make nfs4_put_copy() static 2022-07-29 20:16:59 -04:00
stats.c nfsd: make nfsd_stats.th_cnt atomic_t 2021-12-13 13:42:51 -05:00
stats.h nfsd: make nfsd_stats.th_cnt atomic_t 2021-12-13 13:42:51 -05:00
trace.c
trace.h NFSD: Move nfsd_file_trace_alloc() tracepoint 2022-07-29 20:16:07 -04:00
vfs.c Notable regression fixes: 2022-07-02 11:20:56 -07:00
vfs.h NFSD: Clean up nfsd_open_verified() 2022-05-20 13:18:25 -04:00
xdr3.h SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
xdr4.h NFSD: verify the opened dentry after setting a delegation 2022-07-29 20:17:00 -04:00
xdr4cb.h
xdr.h NFSD: prevent underflow in nfssvc_decode_writeargs() 2022-03-15 09:35:56 -04:00